AVK rivet nuts. Made in the USA. 

Steel blind rivet nuts have an internal thread that can be installed into a panel, tube or other structure from the front side without need to see or access the backside, or "blind" side to complete the installtion. Once installed they remain captive to which a mating component can be attached using standard fastener.

Made in the USA, these cold forged high precision rivet nuts are great for numerous applications. Ideal for punched or drilled holes they can be installed using a manual, air or cordless tool, either before or after finish coat is applied.